Do you make regular use of the "Not Interested" button when new recommendations are shown? That might be why.

I do this, and if the recommended video has even a hint of "Youtube optimization", e.g. yelling face or all-caps clickbaity title, I click "Do not Recommend Channel".

The problem is that YT then starts recommending an endless number of clips from stuff I haven't explicitly blocked (say Simpsons or 30 Rock clips). And eventually that starts getting annoying too, so I end up hitting "not interested".

The cycle starts all over again when I manually search for a clip from one of those shows.

Because you use an adblocker. Without it it’s better but not by much. I believe the real recommendations are only for paid accounts?

I'm using YouTube Premium and I also have the same repetitive recommendations. It also won't stop recommending me something on my homepage unless I click "do not show" or finally relent and click the video recommendation.

I use an Apple TV signed into YouTube

I believe it matters if the same account is used on other devices that have adblock. But this is just a guess.

I don’t use Adblock